document.write( "Question 147460: Faced with the rising fax costs, a firm issued a guideline that transmission of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation 4.45 pages. (a). At the .01 level of significance, is the true mean greater that 10? (b) Use Excel to find the right-tail p-value. \n" ); document.write( "

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Faced with the rising fax costs, a firm issued a guideline that transmission of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation 4.45 pages.
\n" ); document.write( "(a). At the .01 level of significance, is the true mean greater that 10?
\n" ); document.write( "Ho: u = 10
\n" ); document.write( "Ha: u > 10
\n" ); document.write( "I ran a T-test and got the following results:
\n" ); document.write( "test statistic: t = 5.908...
\n" ); document.write( "(b) Use Excel to find the right-tail p-value.
\n" ); document.write( "p-value = P(5.908,10,df=34)= 0.0000005758...
\n" ); document.write( "Conclusion:
\n" ); document.write( "Since p-value is less than 1% reject Ho.
\n" ); document.write( "The mean number of transmissions is greater than 10.
\n" ); document.write( "===============
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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